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題 名 | Stress Analysis of FSW Tools under Torsional and Bearing Loads=扭轉與軸承負荷下FSW刀具之應力分析 |
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作 者 | 林烱陸; 林偉邦; 楊一弘; 戴鑑廷; | 書刊名 | 黃埔學報 |
卷 期 | 52(工程科學類) 2007.03[民96.03] |
頁 次 | 頁33-45 |
分類號 | 472.14 |
關鍵詞 | FSW焊接; 應力; 強度; 刀具形狀; FSW welding; Stress; Strength; Tool shapes; |
語 文 | 英文(English) |
中文摘要 | 本文對兩種常用外形的摩擦攪拌焊接(FSW) 刀具在進行接合工件所經摩擦攪拌過程時的結構性強度加以分析;第一種刀具為同一材質製成有一短圓銷頭根部連接在具圓角的刀柄肩部形狀者,第二種刀具為二件式由一長圓銷桿件穿過另一圓環狀材料構成的刀柄肩部組成外形和第一種刀具相似者。工作時,刀頭在融接工件中承受側向的軸承壓力與黏滯性摩擦扭矩的作用,軸承壓力大小與橫向進刀速度有關但摩擦扭轉負荷本質上是材料在固溶線區塑性狀態的固定性質。當兩種刀具皆受同樣負荷就可比較產生之應力來合理評估強度,軸承壓力可以工件材料的降服強度等級大小來考慮而摩擦扭矩則以全面的剪切黏滯性應力分佈來決定。實體的刀具模型是利用結構分析用的有限元素工具方法來進行所加負荷條件之強度應力求解。 |
英文摘要 | Friction Stir Welding (FSW) Tools of two commonly used geometric features are studied for structural strength when they are used to join the work-piece by the friction-stir process. One of the tool is made from the same one-piece material with a probe of round pin attached to a scrolled shoulder, while the other is a two-pieces tool with a pin inserted into a separate ring which acts like a shoulder and form similar pin on shoulder configuration like the first one. In operation, both tools are subjected to lateral bearing loads during transverse motion of the tool as well as the viscous frictional torsion loads caused by tool spinning. Lateral loads vary with the travel speed of the tool while frictional torsion loads are virtually invariant in the material plastic state at temperature near solidus. A comprehensive way of judging the strength of these tools have been established by comparing the stresses in these two tools when they all subjected to the same loading conditions. Physical tool models subjected to loading conditions as happened in actual FSW process are analysed using FEM tool of structural analysis. Bearing pressure is expressed by the order of magnitude of the weld’s yielding stress and the frictional torsion is determined by the viscous shearing stress prevails in the softened plastic zone close to the pin surface during the whole FSW process. |
本系統中英文摘要資訊取自各篇刊載內容。